第四周。

OOP/04/Exercise01.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+
+class Date {
+private:
+    int d, m, y;
+
+public:
+    Date(int dd = 0, int mm = 0, int yy = 0);
+    void addDay();
+    friend Date operator ++(Date& D);
+    friend Date operator ++(Date& D, int);
+    void Print();
+};
+
+Date::Date(int dd, int mm, int yy): d(dd), m(mm), y(yy){};
+
+Date operator ++(Date& D) {
+    D.addDay();
+    return D;
+}
+Date operator ++(Date& D, int) {
+    Date tmp = Date(D);
+    D.addDay();
+    return tmp;
+}
+
+void Date::addDay() {
+    this->d++;
+}
+
+void Date::Print() {
+    std::cout << this->d << "," << this->m << "," << this->y << std::endl;
+}
+
+int main() {
+    Date aDay = Date(12,3,2023);
+    aDay++.Print();
+    aDay.Print();
+    (++aDay).Print();
+    aDay.Print();
+    return 0;
+}

OOP/04/Exercise02.cpp

@@ -0,0 +1,119 @@
+#include <iostream>
+
+class String {
+private:
+    char *str;
+
+public:
+    String();
+    String(String &otherStr);
+    String(char *otherStr);
+    ~String();
+
+    bool operator==(String &otherStr);
+    bool operator>(String &otherStr);
+    bool operator<(String &otherStr);
+    String& operator=(String& otherStr);
+
+    char *getStrPtr();
+    void printOut();
+};
+
+String::String() {
+    this->str = NULL;
+}
+
+String::String(String &otherStr) {
+    this->str = new char[strlen(otherStr.getStrPtr()) + 1];
+    strcpy(this->str, otherStr.getStrPtr());
+}
+
+String::String(char *otherStr) {
+    this->str = new char[strlen(otherStr) + 1];
+    strcpy(this->str, otherStr);
+}
+
+String::~String() {
+    if (this->str != NULL) {
+        delete[] this->str;
+    }
+}
+
+bool String::operator==(String &otherString) {
+    if (this->str == NULL) {
+        if (otherString.getStrPtr() == NULL) {
+            return true;
+        }
+        else {
+            return false;
+        }
+    }
+
+    return (strcmp(this->str, otherString.getStrPtr()) == 0);
+}
+
+bool String::operator>(String &otherString) {
+    return strcmp(this->str, otherString.getStrPtr()) > 0;
+}
+
+bool String::operator<(String &otherString) {
+    return strcmp(this->str, otherString.getStrPtr()) < 0;
+}
+
+String operator+(String &lhs, String &rhs) {
+    String tmp(new char[strlen(lhs.getStrPtr()) + strlen(rhs.getStrPtr()) + 1]);
+    strcpy(tmp.getStrPtr(), lhs.getStrPtr());
+    strcat(tmp.getStrPtr(), rhs.getStrPtr());
+    return tmp;
+}
+
+String& String::operator=(String &otherString) {
+    if (this->str != NULL) {
+        delete[] this->str;
+    }
+    this->str = new char[strlen(otherString.getStrPtr()) + 1];
+    strcpy(this->str, otherString.getStrPtr());
+    return *this;
+}
+
+char *String::getStrPtr() {
+    return this->str;
+}
+
+void String::printOut() {
+    std::cout << this->str << std::endl;
+}
+
+int main() {
+    char *str1 = new char[10];
+    char *str2 = new char[10];
+    std::cout << "String 1: ";
+    std::cin >> str1;
+    std::cout << "String 2: ";
+    std::cin >> str2;
+    String string1(str1);
+    String string2(str2);
+    String string3 = string2;
+    string1.printOut();
+    string2.printOut();
+    string3.printOut();
+    string3 = string1;
+    string3.printOut();
+    (string1 + string2).printOut();
+    if (!(string1 > string2)) {
+        std::cout <<"String1 NOT > String2" << std::endl;
+    }
+    
+    if (string1 < string2) {
+        std::cout <<"String1  < String2" << std::endl;
+    }
+
+    if (string1 == string3) {
+        std::cout << "String1 = String3" << std::endl;
+    }
+
+    if (!(string2 == string3)) {
+        std::cout << "String2 != String3" << std::endl;
+    }
+    return 0;
+}

OOP/FiveInARow/main.cpp

@@ -37,7 +37,8 @@ int main() {
 
     aBoard->show();
     putChessPieceResult result;
-    bool nowMovePlayerIndex = false;
+    bool nowMovePlayerIndex =
+        players[0]->getName() > players[1]->getName() ? BLACK : WHITE;
     // 只有两种状态，bool足够
 
     do {
@@ -104,7 +105,7 @@ int main() {
                                 '\n');
             } while (input != 'y' && input != 'Y' && input != 'n' &&
                      input != 'N');
- 
+
             if (input == 'y' || input == 'Y') {
                 aBoard->reset();
                 aBoard->show();